1295_Physics ProblemsTechnical Physics

1295_Physics ProblemsTechnical Physics - 636 P46.40...

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636 Particle Physics and Cosmology P46.40 (a) ′= + =+ λλ λ nn n vc Z 1 1 1 af 1 1 1 2 + Z 11 1 22 += + − F H G I K J + v c Z v c Z v c ZZ F H G I K J ++ 2 ej = + F H G I K J 2 2 2 (b) R v H c H == + F H G I K J 2 2 2 P46.41 vH R = H = × 17 10 2 . m s ly (a) v 200 10 34 10 64 .. ×= × ly m s + 1 1 590 1 000 113 3 590 07 bg nm (b) v 86 × ly m s + = 590 10 0 1 1 3 3 0 1 1 3 3 597 . . nm (c) v 97 × ly m s + = 590 1 1 3 3 1 1 3 3 661 . . nm P46.42 (a) Wien’s law: max . T 2898 10 3 mK . Thus, max = ×⋅ = = −− 106 10 106 33 3 2.73 K m m m T . (b) This is a microwave . *P46.43 We suppose that the fireball of the Big Bang is a black body. IeT × σ 48 4 6 1 5 67 10 2 73 3 15 10 () . . . Wm K K Wm 24 2 As a bonus, we can find the current power of direct radiation from the Big Bang in the section of the universe observable to us. If it is fifteen billion years old, the fireball is a perfect sphere of radius
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This note was uploaded on 12/15/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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